> What's wrong with it?

Well, it's certainly going to cause many people to discount your opinion because they presume you have an racist agenda. It looks like a username consciously chosen to create offense while being plausibly deniable. Please be cautious of causing harm to a community for sake of social commentary. Needlessly creating offense is a negative, but maybe you can figure out how to use the dissonance to turn it into a net positive.

I chose it because it was first initial - last name, although I did have a tall German speaking friend who would always say "Nicht lang, aber ganz kurz" every time he'd see me. It took me a while to figure out what he meant. So depending on what you are into, maybe.